Propeller



. J. A. s u'r ER PROPELLER Filed Mai-ch 7. ;925 2 Sheets-Sheet 1 JNVENTORJ JbZzwZ.SzdteI n BY AITORNEY.

July 20 ,1926. 1 3,516 J. A. SUTTER PROPELLER Filed March 7. 1925 2 Sheets-3heet 2 INVENTOR.

' 6 ATTORNEY.

Patented July 2%, 192355,

YORK, n. Y.

ERQPELLER.

Application filed March 7, 1925.

Thisinvention relates to propellers of the three-blade weedless type, and has for its object to provide, in a manner as hereinafter set forth, propeller of the class re ferred to, having its blades arranged in such relation with respect to each other and'with the forward'and entering edges thereof so constructed as to throw off any weeds, logs, driftwood or other debris when the propeller is operating forwardly.

I A further object of theinvention is to provide, in a manner as hereinafter set forth, a three-blade propeller of the type referred to, having the blades thereof constructed whereby the entering and leaving edges of each blade, will be positioned within a radius of 120 degrees.

A further object of the invention is to provide, in a manner as hereinafter set forth, a three-blade propeller of the type referred to, with theblades thereof so con' structed and arranged whereby the blades will not overlap each other at the intersection with the hub, thereby providing for expeditiously molding the propeller.

It has been the practice heretofore in making three-blade propellers, which are full Weedless, to so construct the blades on the hub that they would extend around the hub to 170 degrees. This causes each blade, when using 3 blades, to overlap the other blades 50 degrees, and, therefore, it is impossible to mold the'propeller by the ordinary method and necessitates the employment of cores and drawbacks in making or constructing the propeller. A. propeller, in accordance with this invention, is so de signed to overcome this ditficulty in molding, as each of the blades is so placed on the hub to come within 120 degrees and by such arrangement the propeller can be constructed in two hours, Whereas when using the cores to overcome the difficulty in molding, where the blades overlap, it requires a molder approximately eight hours to make the same. A further object of 'the invention is to provide, in a manner as hereinafter set forth,-a three-blade weedless propeller, hav ing each of the blades setup with respect to the'hub, whereby the blade will be arranged within 120 degrees and further whereby the blades are so constructed as to have a cam shape on the entering or forward edge so as to throw off any weeds, logs, driftwood or other debris while turning in the forward motion.

Serial No. 13,910.

Further objects of the invention are to provide a three-blade Weedless propeller, in a manner as hereinafter set forth, which is simple in its construction and arrangement, strong, durable, thoroughly efficient in its use, and convenient to manufacture.

With the foregoing and other objects in view, the invention consists of the novel construction, combination and arrangement of parts, as hereinafter more specifically described and illustrated in the accompanying drawings, wherein is shown an embodiment of the invention, but it is to be understood that changes, variations and modifications can be resorted to which come within the scope of the claims hereunto appended.

In the drawings wherein like reference characters denote corresponding parts throughout the several views Figure 1 is an elevation looking towards the outer side of the propeller.

Figure 2 is an elevation looking towards the inner side of the propeller.

Figure 3 is a perspective view when the propeller is seated on its inner side.

Figure 4 is a perspective view when the propeller is seated on its outer side.

Figures 5 and 6 are diagrammatical views illustrating one of the blades. 7

Referring to-Figures 5 and 6, the blade is indicated at O. A indicates .33 of diameter, radius for width of blade developed area. 13 indicates the offset of the blade which shall be approximately .267 of diameter from a 90 degree generatrix. This will vary with pitch variations. The blades shall at no time be nearer than 5 degrees on projected area, as indicated at C, the same to be overcome by a slight change from the true screw within .07 of diameter rom hub. The diameter of the hub is indicated at D, and such diameter is .125 of which diameter with the face enlargement necessary to obtain a fillet (approximately .0625 of diameter) to offset a sharp filletangle. The hub length is indicated at E and such length should be approximately .2143 of diameter. This will not be standard, as pitch change will alter same to some extent. The center of the blade face is indicated at F and its ratio .125 above true center of the hub; this will not be standard throughout with respect to all diameters and pitches as a variation may show in different pitc es. As indicated at G, there shall be a diversien from true screw on leading edge approximately .133 from center line of shaft to form the necessary convex face (otherwise weedless from fillet). The ratios G and D shall be basis for the same. The shaded lines show relation of G and D. H indicates the leading edge of the blade.

As setting forth one example of a threeblade weedless propeller, in accordance with this invention, attention is directed to the following:

.33 of diameter for blade width.

.125 of diameter for hub diameter.

Face fillet and hub dimensions change with size of wheel. 1% larger on wheel 14 dia. at intersection of blade and hub than on hub ends.

5 radius from entering edge of blade shall be a point 2% from ratio .1875. This radius shall be used on blade after setting up.

There shall be at least degrees between edge of blade at hub on three-blade wheel.

There shall be no given widths or blade ar as other than an intersection between a .33 radius at perimeter and hub (hub intersection is governed by a ratio of .125 of diameter) other than 5 radius on 14". This edge to be laid on surface of finished pattern.

Center of blade width 1% above true center of 1 t" wheel ratio .125.

A basis of offset for center of blade shall be 352 3 off a 90 degree angle, this point changing with pitch changes on projected area. Ratio .268. Ratio of hub enlargement to obtain proper fillet.

Referring to Figures 1 to 4, both in elusive, each of the blades is indicated at 1, the hub at 2 and the neck portion of each of the blades which projects from the hub 2 is indicated at 3. Each, of the blades 1 is arranged within 120 degrees. as indicated at t. The blades 1 are set up relatively to each other so that they shall at no time be nearer than 5 degrees on projected area. The following and entering edges 5, 6 respectively of each blade are arranged within 120 de grees with respect to the hub. There shall be at least degrees between the edges of the blades at the hub.

The blades, at their point of mergence with the hub. are flush with one end of the latter, as indicated at T, Figure 3. and spaced from the other end of the latter, as indicated at 8, Figure &. The outer portion of each of the blades, as indicated at 9, Figure 1-, extends in an opposite direction with respect to the inner portion, as indicated at 10, Figure 4, and the blade is upon a torsional curvature or convex to provide for the setting up of the portion 9 with respect to portion 10, as shown in Figure 4.

Each blade has its forward or entering edge cam-shaped to throw oil the weeds, etc., when the propeller is turning in the forward motion and each blade is so constructed to prevent the overlapping of the blades at the intersection with the hub, as clearly shown in Figures 1 and 2. Each blade is set at the desired pitch with respect to the hub and preferably as shown in Figures 3 and L. The blades throughout are disposed relatively to each other to prevent an y. overlapping thereof.

It is thought that the many advantages of a three-blade weedless propeller, in accordance with this invention, can be readily understood. and although the preferred embodiment of the invention is as illustrated and described, yet it is to be understood that changes in the details of construction can be had which will fall within the scope of the invention as claimed.

lVhat I claim is 1. A three-blade propeller of the weedless type having the points of the entering and follower edges of each blade adjacentthe hub arranged within 120 degrees with re spect to the latter to overcome any overlap of the blades and to further provide a clear space between the blades ad acent the hub, the entering edge of each of said blades being of convex curvature throughout the follower edge of each of said blades having the outer portion thereof of convex curvature and the inner portion of concave curvature, the said outer portion being of greater length than the said inner portion, and the entering edge of each of said blades starting from the periphery of the hub forwardly thereof on a line parallel to a radius of the hub at a point removed by approximately 90 degrees from the point of intersection of said radius with the circumference of the hub.

2. A three-blade propeller of the weedless type having the points of the entering and follower edges of each blade adjacent the hub arranged within 120 degrees with respect to the latter to overcome any overlap of the blades and to further provide a clear space between the blades adjacent the hub, each of said blades having theccnter of its width at a point approximately above point .125 of the center line of the length of the hub thereby holding the fore and aftcontour of the blade within appropriate limits.

In testimony whereof, I ailix my signaire hereto.

JOHN A. SUTTElt. 

